After checking the 120vac troubleshoot section of the manual (link attached) it does not look like there is a control relay used at all......just hard wired AC.
https://www.manualslib.com/products/...e-9990224.html
From your description it sounds like you are having wiring connector issues (either the removable connector or the cct board edge connector). Maybe the high heating element current has overheated those specific connectors? This causes surface oxidation and then more overheating etc. If not cleaned up it can cause a fire (or melted connector minimum). Sounds like the heater element connection opens up though, so it stops the current flow. This may not always happen in future though.
The question is which side is causing the problem? If it’s the removable connector you might be able to repair/replace it with a new piece or specific pin(s). In some cases pins can be removed and replaced in certain high quality connector bodies. Probably not and easy job without proper tools, space to work and a little slack in the wiring, re-soldering etc.
I would contact the manufacturer first and advise them of your issue. There might be a recall on this, or a good will free replacement board or connector body for you.
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